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xen-users
Re: [Xen-users] Vif dropping packets
I'm not entirely sure what you are asking with that second question. sar
is installed in the guests. I did `sar -u1 1000` to watch the status for
a while. Here is an abbreviated output with the averages and the line I
saw with the highest %steal
04:13:12 PM CPU %user %nice %system %iowait
%steal %idle
04:13:16 PM all 0.00 0.00 0.00 0.00
0.99 99.01
Average: all 0.01 0.00 0.02 0.55
0.05 99.37
Overall, these vms aren't doing a lot. Mainly sitting idle waiting for a
QA engineer to test code functionality. I should probably say a little
more about the config. The host boxes are dual quad-core Opteron 2346HE
systems with 24GB of memory and a ton of disks. Currently there are 28
virtual machines running on the one I have been checking but most of
them idle.
Hope that helps or is what you were looking for.
mike
Peter Booth wrote:
Mike,
You don't say anything about the workload on your system or the
resource consumption that it causes.
Do you have sar installed on the domUs? Does a one second vmstat show
a %st that's above 1%?
Sent from my iPhone
On Jun 26, 2009, at 4:22 PM, Mike Lovell <mike@xxxxxxxxxxxx> wrote:
I have a problem with packets being dropped on some vif interfaces. I
currently have a box running Debian Lenny with Xen 3.2.1. The host is
running the Xen-ified kernel from the Debian repos.
2.6.26-1-xen-amd64. The host has a single bridge, 'vmnet', that
connects to one physical interface and all of the guest's interfaces
connect to. If I do a 'ifconfig vifX.0', I see dropped TX packets.
Looking at the guest does not show any dropped packets on its interface.
From the host
# cat /etc/network/interfaces
auto vmnet
iface vmnet inet static
address 10.135.2.71
netmask 255.255.255.224
bridge_ports eth1
bridge_stp off
bridge_fd 9
bridge_hello 2
bridge_maxage 12
# brctl show vmnet
bridge name bridge id STP enabled interfaces
vmnet 8000.003048c8166d no eth1
vif22.0
...
<lots of interfaces>
# ifconfig vif22.0
vif22.0 Link encap:Ethernet HWaddr fe:ff:ff:ff:ff:ff
inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link
UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1
RX packets:7946252 errors:0 dropped:0 overruns:0 frame:0
TX packets:8282858 errors:0 dropped:160 overruns:0 carrier:0
collisions:0 txqueuelen:32
RX bytes:5758663699 (5.3 GiB) TX bytes:5887860418 (5.4 GiB)
From the guest
# ifconfig eth0
eth0 Link encap:Ethernet HWaddr 00:16:3E:02:00:91 inet
addr:10.135.2.91 Bcast:10.135.2.127 Mask:255.255.255.192
inet6 addr: fe80::216:3eff:fe02:91/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:8283072 errors:0 dropped:0 overruns:0 frame:0
TX packets:7946364 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:5887884877 (5.4 GiB) TX bytes:5869927068 (5.4 GiB)
# cat /etc/network/interfaces
auto eth0
iface eth0 inet dhcp
post-up ethtool -K eth0 tx off
I am a stumped on this and it is causing some problems for some of
the applications that are being tested across the virtual machines.
For example, one app on one vm needs to connect to a database, on
another vm, but it can't and complains. Do any of you know what might
be causing this or any ways to fix this? Thanks in advance.
mike
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